Owner's Manual

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To verify that each node can detect each storage LUN or logical disk, perform the
following steps:
1 For Dell|EMC Fibre Channel storage system, verify that the EMC
®
Navisphere
®
agent and the correct version of PowerPath
®
are installed on
each node, and that each node is assigned to the correct storage group in your
EMC Navisphere software. See the documentation that came with your
Dell|EMC Fibre Channel storage system for instructions.
NOTE: The Dell Professional Services representative who installed your cluster
performed this step. If you reinstall the software on a node, you must perform this
step.
2 Visually verify that the storage devices and the nodes are connected correctly
to the Fibre Channel switch (see Figure 1 and Table 1).
3 Verify that you are logged in as root .
4 On each node , type:
more /proc/partitions
The node detects and displays the LUNs or logical disks, as well as the
partitions created on those external devices.
NOTE: The listed devices vary depending on how your storage system is
configured.
A list of the LUNs or logical disks that are detected by the node is displayed,
as well as the partitions that are created on those external devices. PowerPath
pseudo devices appear in the list, such as
/dev/emcpowera , /dev/emcpowerb ,
and
/dev/emcpowerc .
In the case of a direct-attached SAS, or iSCSI configurations, the virtual disks
will appear as
/dev/sdb and /dev/sdc and so on.
5 In the /proc/partitions file, ensure that:
• All PowerPath pseudo devices appear in the file with similar device names
across all nodes.
For example,
/dev/emcpowera , / dev/emcpowerb , and /dev/emcpowerc .
• In the case of MD3000/MD3000i, all the virtual disks appear in the file
with similar device names across all nodes.
For example,
/dev/sdb , /dev/sdc , and /dev/sdd